Blacksmith keys

I have an idea I would like to see for the blacksmith keys.Now that keyrings is gone and you have to have them in your bagswhy not make a master key instead of the consumables like they are now.I would like for them to be like the enchanting rod works now, 1 master key that you upgradeas your skill increase, like silver master key,gold master key and so on instead of having it asan consumable, would be a cool addition to the blacksmith trade imo.